To celebrate Throwback Thursday [1], we're taking a look at some of the most adorable pictures sexy stars have shared from their earlier years. Celebrities like Justin Timberlake [2] and Drake regularly post #TBT photos, but there have also been some memorable gems from stars like Matthew McConaughey [3], Zac Efron [4], and Harry Styles. Get in the nostalgic Throwback Thursday spirit with a look at these supercute snaps, then check out more must-see celebrity Instagrams [5]!

Justin Timberlake

Drake

Matthew McConaughey

Zac Efron

James Van Der Beek

Harry Styles

Tom Brady

Mario Lopez

Justin Timberlake

Jon Hamm

John Legend

Derek Hough

Shemar Moore

Chris Pratt

Drake

Josh Duhamel

James Marsden

Lance Bass

Michael B. Jordan

John Stamos

Justin Bieber

James Franco

Patrick Schwarzenegger

Mario Lopez

Drake

Justin Timberlake

Gavin Rossdale

Usher